<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <button>登录</button>
  <button onclick="outLogin()">退出登录</button>
  <button>获取用户信息</button>
  <button>获取数据列表</button>
</body>
<script>
    function outLogin(){
      let xhr = new XMLHttpRequest();
      xhr.open('post','/outlogin');
      xhr.send();
      xhr.onreadystatechange = () =>{
          if(xhr.readyState == 4){
            console.log(xhr.response);
          }
      }
    }
</script>
</html>